The Talisman is really good. I loved it. Read it. Then read Black House, the sequel. I do believe they're making a mini-series out of The Talisman. Definitely read Eyes of the Dragon and Everything's Eventual. Cell too. I personally like Cujo even though it makes me cry like a baby.
I actually loved the ending of The Dark Tower. It completely blew my mind. I mean, it's definitely not your average ending.
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"Men have forgotten this truth", said the fox, "But you must not forget it.
You become responsible, forever, for what you have tamed."